Satellite detected water extents, as of 25 August 2019 over White Nile, Sennar and El Gazira states in Sudan

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)Imagery and land coverSudan
Sudan

About this dataset

**UNOSAT code: FL20190815SDN** This map illustrates the extent of surface waters detected over El Gazira, White Nile and Sennar states located in the southern part of Sudan as detected by VIIRS-NOAA satellite between 22 & 25 August 2019. In the analysed area, a total of about 7000 km2 are likely flooded and about 250,000 people might be affected by taking into account the WorldPop population estimates. This is a preliminary analysis that has not yet been validated in the field. Please send any field-based comments to UNITAR-UNOSAT.

Documentation

UNOSAT datasets and maps are produced using a variety of methods. In general, analysts closely review satellite imagery, often comparing two or more images together, and determine notable changes between the images. For damage assessments, refugee or IDP assessments, and similar analyses, these changes are then manually documented in the vector data by the analyst. For flood extractions, landcover mapping and similar analyses, a variety of automated remote sensing techniques are used to extract the relevant information which is then reviewed and revised as necessary by the analyst. In all cases, resulting data is then loaded into a standardized UNOSAT geodatabase and exported asshapefiles for dissemination. This is a preliminary assessment and has not yet been validated in the field. It is important to consider the characteristics of the source imagery used in the analyses when interpreting results. For damage assessments it should be noted that only significant damage to the structural integrity of the buildings analyzed can be seen in imagery, while minor damage such as cracks or holes may not be visible at all. For flood extractions using radar data it is important to note that urban areas and highly vegetated areas may mask the flood signature and result in underestimation of flood waters. Users with specific questions or concerns should contact unosat@unitar.org to seek clarification.

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